A prefab house is shortened name for a prefabricated house&comma; which is a home that has components manufactured in an off-site industrial facility&period; They are sometimes referred to as factory-made or modular homes&comma; although there are some differences&period; In a prefab house&comma; the roof and wall units are made in a factory&comma; whereas prefab houses have entire sections of the house build off site&period; By manufacturing the parts of a prefab house off site&comma; the slab put in for a prefab house is much easier to arrange than the foundation of a traditional construction&period;The benefits of buying a prefab house include ease of mobility&comma; speedy construction&comma; and fewer expenses&period; These houses are usually less expensive to build and can be put up in only a few days&comma; complete with wiring and plumbing&period;